Exclusions are done via ant-style path expressions, so all integration tests must follow this pattern and end with “IntegrationTest.java“.

Next, the cargo-maven2-plugin is used, as Cargo comes with top-notch out of the box support for embedded web servers. Of course if the server environment requires specific configuration, cargo also knows how to construct the server out of an archived package as well as deploy to an external server.

An embedded Jetty 7 web server is defined, listening on port 8080. Notice the wait flag being set to true – this is because for the newer versions of cargo (1.1.0 upwards), the default value of the of the flag has changed from true to false, due to this bug. We want to be able to start the project by simply running mvn cargo:start, especially during the development phase, so the flag should be active. However, when running the integration tests we want the server to start, allow the tests to run and then stop, which is why the flag will be overridden later on.

In order for the package maven phase to generate a deployable war file, the packaging of the project must be: <packaging>war</packaging>.

Next, a new integrationMaven profile is created to enable running the integration tests only when this profile is active, and not as part as the standard build lifecycle.

This ensures the cargo:start goal and cargo:stop goals will execute before and after the integration-test phase. Note that because there are two individual execution definitions, the id element must be present (and different) in both, so that Maven can accepts the configuration.

Next, maven-surefire-plugin configuration needs to be overridden inside the integration profile, so that the integration tests which were excluded in the default lifecycle are will now included and run:

1. The test goal of the maven-surefire-plugin is executed in integration-test phase; at this point, Jetty is already started with the project deployed, so the integration tests should run with no problems.

2. The integration tests are now included in the execution. In order to achieve this, the exclusions are also overridden – this is because the way Maven handles overriding plugin configurations inside profiles. The base configuration is not completely overridden, but rather augmented with new configuration elements inside the profile. Because of this, the original <excludes> configuration, which excluded the integration tests in the first place, is still present in the profile, and needs to be overridden, or it would conflict with the <includes> configuration and the tests would still not run.

3. Note that, since there is only a single <execution> element, there is no need for an id to be defined.

Now, the entire process can run:

mvn clean install -Pintegration

Conclusion

The step by step configuration of Maven covers the entire process of setting up integration process as part of the project lifecycle.

Usually this is set up to run in a Continuous Integration environment, preferably after each commit. If the CI server already has a server running and consuming ports, then the cargo configuration will have to deal with that scenario, which I will cover in a future post.

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